Question 549469
They traveled a total of 300km
b+y=300

They biked 70 more km than they bused
b=y+70

Sub in y+70 for b
y+70+y=300
combine like terms
2y+70=300
subtract 70 from both sides
2y=230
divide both sides by 2
y=115
sub in 115 for b
b=115+70

b=185